A cool concept for a Resh umbrella crossover fanfiction would be to make the umbrella a portal - like device. Different characters from various fandoms could be drawn to it, not knowing what it is. Once they touch it, they are whisked away to a new world where they have to team up with other characters they've never met before to solve a mystery related to the origin of the Resh umbrella.
One idea could be to have characters from different universes meet under the Resh umbrella. For example, a character from a fantasy world and a character from a sci - fi world could find themselves taking shelter under the same Resh umbrella during a strange interdimensional storm.
Imagine that in the Resh umbrella world, there is a powerful weapon that could potentially destroy the entire multiverse if it falls into the wrong hands. The Avengers are somehow alerted to this threat. They cross over into the Resh umbrella world. There, they meet characters from Resh umbrella who have different motives. Some want to use the weapon for power, while others want to destroy it. The Avengers have to navigate this complex situation, make allies among the Resh umbrella characters, and ultimately prevent the weapon from being misused.
Begin with brainstorming the significance of the Resh umbrella in your fanfiction. Is it a magical item? A technological wonder? Once you've determined that, think about the characters from different stories you want to bring together. Sketch out a basic plot where the umbrella acts as the catalyst for their meeting. For example, if you're doing a crossover between a post - apocalyptic world and a magical realm, the umbrella could be the key to opening a portal between the two desolate and fantastical places.
Another great crossover could be with 'The Boys'. In this scenario, the Umbrella Academy would be thrown into the world of corrupt superheroes. They would have to navigate the complex politics and power plays while also trying to stay true to their own values and not get caught up in the dark side of superhero - ism.
The characters from Resh umbrella might be initially in awe of the superpowers of the Avengers. For example, Iron Man's high - tech suit would be a wonder to them. Meanwhile, the Avengers might be a bit cautious of the Resh umbrella characters as they come from a more shadowy and secretive organization. But they would soon realize that they have to work together and start sharing their skills and knowledge.
Well, you could have a fanfiction where the umbrella is a key element in a time - traveling adventure. For example, Ladybug and Chat Noir find an old umbrella that transports them to a different era in Paris' history. Or perhaps an akumatized villain uses umbrellas to spread his or her power, and Ladybug and Chat Noir have to find a way to counter this by using the unique properties of Ladybug's own umbrella. Also, it could be that the umbrella is a portal to another dimension, leading to a whole new set of challenges and adventures for our heroes.
One idea could be creating an OC who has the power to manipulate time in a different way than Five. For example, they can freeze time for specific objects or people while the rest of the world continues as normal. This would add a new dynamic to the Umbrella Academy's adventures and interactions with the timeline.
One idea could be exploring what would happen if a new member joined the Umbrella Academy. Maybe a time - traveling superhero from the future who has knowledge of a great threat coming. Another could be a story where the members lose their powers and have to rely on their wits and teamwork in a completely different way. For example, dealing with a powerful enemy who can nullify powers.
One interesting idea could be a crossover with "Moana". Elsa's ice powers and Moana's connection to the ocean could create a really cool dynamic. Maybe Elsa accidentally freezes part of Moana's ocean and they have to work together to fix it. Another could be with "Tangled". Rapunzel's long hair and her adventurous spirit combined with Elsa and Anna's journey in Frozen 2 would be exciting. Rapunzel could use her hair to help them climb mountains or cross chasms. A third idea is a crossover with "Beauty and the Beast". Belle's love for books and knowledge could help Elsa understand more about her powers and the history of magic in the Frozen world.
A great plot could be that The Handler gets amnesia. Losing her memory, she has to rely on the kindness of the Umbrella Academy members she once opposed. This forces her to see them in a new light and also makes her question her own actions. It could lead to a journey of self - discovery for her within the world of the fanfiction.
A Rambo crossover fanfiction could involve him crossing over into the Star Wars universe. Rambo's guerilla warfare tactics could be interesting in a galaxy far, far away. Maybe he helps the Rebel Alliance in a ground - based battle against the Empire. Or a crossover with the Predator series. Rambo would be a worthy opponent for the Predator, and the fight between them in the jungle could be epic. Also, a Rambo and John Wick crossover would be intense, two highly skilled fighters on the same side or perhaps initially at odds.